Sompong Sucompa. 1998. A survey study of current needs and problems in using technical English for tourism for the higher certificate level students of Rajamangala Institute of Technology (RIT). Bangkok:Mahidol University;
Sompong Sucompa. (1998) A survey study of current needs and problems in using technical English for tourism for the higher certificate level students of Rajamangala Institute of Technology (RIT) (รายงานผลงานวิจัย). Mahidol University:Bangkok.
Sompong Sucompa. A survey study of current needs and problems in using technical English for tourism for the higher certificate level students of Rajamangala Institute of Technology (RIT). Bangkok:Mahidol University, 1998.
Sompong Sucompa. (1998) A survey study of current needs and problems in using technical English for tourism for the higher certificate level students of Rajamangala Institute of Technology (RIT) (รายงานผลงานวิจัย). Mahidol University:Bangkok.